Drill and manual support therefor



y 1929- 1 M. O'FARRELL 1,711,688

I 4 DRILL AND MANUAL SUPPORT THEREFOR u Filed Dec. 8, 1925 L a MD Q m4 V.F mo

BYA/s ATTORNEY Patented May 7, 1929.

,. UNITED. STATES 1 1,711,6as A ENTeOFFI I MATTHEW AnRELL, or DETROIT, MicHIG'Am'Ass'Ie Non 'ro CHICAGO PNEUMATIC TOOL COMPANY, on NEW YORK, N. Y., A GQBPORATION or new JERSEY.

"DRILL" am) MANUAL surr'on'r THEREFOR.

Application 'filed Decemb er 8, 1925. Serial No. 73,997. I

This invention relates to drilling machines and to arrangement for manually support ing the same. It is particularly concerned with'machines of the percussive type used in mining,'quarrying and-similar operations and commonly referred to as rock drills.

In using rock drills it is frequently necessary to change from cradle or shell mounted machines to manually supported machines. In order thattwo sets of drills ma-y notbe required it is essential that the cradle supported drill becapable of having a handle device attached thereto which will enable the drilltobe manually directed. Hence one objectof'the invention is to provide adrilling machine of the type described arranged to have a handle device readily attached thereto or detached therefrom at will. Another object is to so design the drill and handle 'device that the application 'and the removal of the latter will not necessitate disturbingthe assembly of thedrilling machine. Another object is to relieve the manual supporter of the machine of the shocks and vibrations in cident to the operation of the machine. Further objects relate generally to simplifying.

and to improving prior structures devised for similar'purposes. V f

In order to illustrate the invention one concrete embodiment thereof is shown in the accompanying drawing in which the single view is a front elevation of a percussive drilling machine.

In the embodiment of the invention chosen for the purpose of -illustration the percussive drill which may be of the fluid pressure typecomprises a cylinder having a back head 2 and front head 3 theseparts being maintained in assembled relation by the usual side bolts 4 which may, seat in guides 1 on cylinder 1.

To permit a handle device to be readily secured to the drill the rear and front heads, 2 and 3, are provided with-extensions 2 and 3? respectively having aligned openings Q' and 3* respectively. The handle device is formed with a grip portion 5 having spaced rods 6 extending therefrom and arranged to extend through the aligned guide openings 2 and 3 ofthe rear and front heads of the drill. Suitable means, such as springs, are arranged to engage stops on the handle device and adjacent portions of the machine in order to absorb the shocks and vibration produced by the latter. A preferred arrangement for this purpose is illustrated in the drawing wherein rods 6 on oppositesides of-collars 9 which may be fixed to rods'fi in any suitable manner as by pins 10. The outerends of the springs thusengage the projecting portions 3 and-f2 of the front and back heads. In this contact with lugs This brings all of springs 8 into operation with the result that they absorb'to a-large extent, if not entirely, the vibratioln'shocks and reaction of the drill which areordinarily communicated directly I to the operator. 7

In assemblingthe handle device upon the drill it is apparent that it is entirely unnecessary to disturb the drilling machine itself or to disconnect any parts thereof. The rods 6 '-of the handle device are first inserted throughthe openings 2 in the lateral extensions 2v of back head 2. The rearward springs 8 are first slipped over rods 6 after the same have passed through the back head.

forward springs 8. The threaded outer ends coiled springs 8 are mounted onthe handle I Then the collars 9 are applied and then the of the rod 6 are then pushed through the openings 3* in the lateral extensions 3 of the front head 3 and the stop nuts 7 are applied.

The collars 9 are then fixed in position upon rod 6 by inserting pins 10 and the drilling machine is ready for use as a hand supported tool. The handle device is as readily removed from the drilling maehineby reversing the, steps of the process above outlined.

While but one form of the invention has been herein shown and described, it is to be .der, front and back heads, and side bolts securing said parts in assembled relation, a handle device comprising a grip part and spaced rods extending therefrom, said heads being provided with guide openings for said rods, means for preventing withdrawal of said rods from said openings but permitting 1 limited movement, of the same therein, and

means on said rods between said heads for llO 2. In combination, a drill having a cylinder, front and back heads, and side bolts securing said parts in assembled relation, a handle device comprising a grip part and spaced rods extending therefrom, said heads being provided with guide openings for said rods, means for preventing withdrawal of said rods from said openings but permitting limited movement of the same therein, and means including coil springs on said rods in engagement with said heads for 'yieldingly resisting such movement.

3. In combination, a drill having a cylinder, front and. back heads, and side bolts securing said parts in assembled relation, a handle device comprising a grip part and spacedrods extending therefrom, said heads being provided with guide openings for said rods, means for preventing Withdrawal of said rods from said openings but permitting limited movement of the same therein, stops rods permitting relative movement, stop collars fixedly secured to said rodsintermed ate said front and back heads, and coil springs encircllng said rods on opposite sides of said collars yieldingly to reslst the movement of said handle device.

5. In comb1nat1on,a Clllll having a cyhnder, front and back heads, through bolts securing said parts in assembled relation, said heads having extenslons 1n the plane of and beyond said side bolts, said extensions having aligned openings, a handle device havlng rods extending through said aligned openings, and means on'said rods lntermediate said heads ncluding resilient members 1n engage- I ment with the latter for cushioning the movetel-mediate said heads, and coil springs encircling said rods on oppositesides of said collars for cushlonmg the movement of said device.

Signed by me at Detroit, Miclr, this 4th day of December, 1925. v

MATTHEW OFARRELL. 

